I'm running training at the MET's video forensics lab soon and part of it is explaining how DCT-based compression works and particularly the effects of corruption on long-GOP MPEG transport streams as delivered in DVB-MUXes. One of the illustration videos is below.
Three clips; each with a momentary corruption to the data stream and in each case you can see how the decompressor can't reconstruct a proper picture until the next i-Frame. The second half of the clip shows me framing through with the I, B, or P frame indicated top-left - you'll need to make it full screen to see that as the marker is quite small.
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